4. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
4.11 Charging Trouble Shooting
1. Charging Procedure
- Connect TA or u-USB Cable
- Control the charging current by BQ25040 IC
- Charging current flows into the battery
2. Check Point
- Connection of TA or USB Cable
- Charging IC (BQ25040)
- Battery
3. Troubleshooting Setup
- Connect TA and battery to the phone
4. Troubleshooting Procedure
- Check the charger (TA or USB Cable)
- Check the OVP Circuit
- Check the Charging IC
- Check the battery
CN4000
11
10
9
5
4
3
2
1
8
7
6
VA4000
ZD4001
FL4001
5
6
3
1
4
2
P2
P4
P1
P3
P6
P5
VBUS_CHG_IN
C4001
22p
FL4000
1
IN
OUT
GND1 GND2
USBH_DP
USBH_DM
USB_ID
2mm
VBUS 2mm
u-USB Connector
R4003
3K
R4002
750
U4000
PGND
11
IN
1
BAT
10
ISET
2
_PG
9
VSS1
3
CHG
8
LDO
4
VSS2
7
IFULL
5
EN_SET
6
C400
5
1u
VREG_MSME_1.8V
1u
C4006
C4000
1u
10K
R4001
VBAT
CHG_EN
EOC
VBUS_CHG_IN
VCHG_VBUS
CHARGING IC
100mA
700mA
TA (5.1V, 700mA)
TA
Main Battery